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Old 07-24-2013, 09:16 AM   #1
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Pergola design question

I have some design questions about a pergola design. It will be 14 feet wide by 12 feet long and made from pressure treated lumber (painted). I am replacing a pergola attached to my townhouse on two sides. The two sides of the townhouse form an “L” shape. I want to cover the pergola with polycarbonate sheets.

Because of my community regulations, I can’t expose the cover. So, my idea is to space my 2 x 10 rafters 24 inches apart and then attach 2 x 2’s inside the rafters creating a 4:12 slope. The polycarbonate would be fastened to the 2 x 2’s and supported with a 2 x 2 cross member every 2 feet. I live in Miami Florida and plan to use hail proof polycarbonate.

Similar to the method used to attach the polycarbonate sheeting, I would run another 2 x 2 inside the rafters creating 2’ x 2’ boxes that will have bamboo matting stapled to it. Lastly, to create a finished look, I would cover the visible perimeter of the boxes after the bamboo is stapled with 1 x 2’s.

My 14-foot wide beam will be 3 2 x 10’s sandwiched together with adhesive and screws and then attached to the top of my 6 x 6 post with BCS post caps. The 2 x 10’s would have to span 10 feet from the side of the house to the top cross member. The 2 x 10’s would be fastened to the house using joist hangers. They would not be visible from below.

Is my design idea faulty, will the 3 2 x 10’s support the load of the pergola? Will the 10' span of the rafters be okay with the minimal added weight of the polycarbonate and bamboo? Do I have enough slope to allow for drainage of rain water? Any ideas are welcome. Thanks


malapp1 is offline   Reply With Quote
Old 07-24-2013, 04:56 PM   #2
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You really need to prepare plans and show them to your local building inspector. Or talk to the building inspector first, then prepare plans based on local code.

Personally I have no idea what code requirements are for pergolas with polycarbonate roofing in Florida, but I am quite certain your building inspector will be able to help you there. I am not trying to blow you off, but asking for free design help over the internet on a project specific issue is not likely to get you far. At worst, you could get "assistance" that is not code compliant in your area, which would potentially be a mess if you followed it.


Daniel Holzman is offline   Reply With Quote

pergola , pergola cover , pergola design

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